Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cf9de925d27803e…

MALICIOUS

PDF

86.5 KB Created: 2021-07-02 11:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9b3c7daa3a794432318027822ac1f1b SHA-1: 7bde453bc7cdd955d976eef53581d8e492809f2e SHA-256: 1cf9de925d27803e77028044d1a11813f7a8719dedb9df1749c9e12349a85dee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a likely attempt to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an intent to redirect the user to external resources. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://stopserv.ru/files/file/xipanosanevabiwokulis.pdf In PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d959759d4---jurukik.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/75451406930.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vogotawulamibojaj.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/kodinomuxebidelibesagep.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160753f68356e6---sixejurudalinidojo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/92ce6025a4d7b22de7443754da48a24a/98724986780.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad329d0b8---53942183784.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/51091289565.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/deae3e8d5e98c0f505bf675974a50a3e/watifugerejaxenudi.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/dowaseloxupanevide.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ec72dfa955f322d681ea45f4fba85c25/85050680382.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f92ce259c6---sovafetunes.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2c11cf52---wafimuxuxogig.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16486941e4---18071270472.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/nopadufoxabitozopaxutixe.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2e78ac27e66623486fa4acd884a20625/42356714895.pdfIn PDF document text
    • https://numberonerevolution.it/file/73169872669.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/37723924519.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/76840893194.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075aecdc1f60---71498242968.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e22826294---vusekazonis.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/4d08a309cd82ad3ebaed52076c5d477e/donukekupimasali.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/03795b6a17c7c460da103a1945d6e172/94059485495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=parable+of+the+banquetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 17800 bytes
SHA-256: c02ffbb5784cb903399e2deb418ba6cd5e3d29067a59d2afb5bf2a3e326a86a9
font_02_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 10436 bytes
SHA-256: 2c1149a30989c7b6156dc337e79cdc5b1cf72f8a94768e7b42fe087ceb291bff